Swingers features a pair of nine-hole mini-golf courses.David L. Ryan/ Globe Staff

The Boston location, which spans more than 20,000 square feet, is the London-born chain’s fourth in the US, following outposts in New York City, Washington, D.C., and Las Vegas.

“Boston was always [in] the plan” for Swingers, said Enany, but the opening was years in the making. Swingers committed to 777 Boylston about 18 months ago, Enany said — “we fell in love with this site” — and the extensive buildout took about a year, he said.

Despite what Enany called the “shiny nature” of the brand, the team took care to preserve certain architectural details of the space, such as exposed brick and beam. “We kept it really true to the way that we found it,” said Enany.

One of the cocktail bars at Swingers.David L. Ryan/ Globe Staff

Windows look out onto Boylston Street from both the downstairs “Carousel” mini-golf course and the upstairs “Spinner” course, which each challenge players with obstacles that look like county-fair-style rides, such as a miniature Ferris wheel. Waiters, called “caddies,” ferry drinks to the courses, each enveloped in flowers.

“I think we always go back to our roots, and that there’s that English countryside, sort of garden party feel to it,” said Enany.

Upstairs, flashing lights beckon patrons into the “Carnival,” a nostalgia-soaked video arcade outfitted with Skee-Ball, whack-a-clown, and a Connect 4 basketball shooter game. (The standard Swingers ticket, for $25 a person, includes a round of mini-golf and 30 minutes in the arcade.)

The “Carnival” arcade at Swingers.David L. Ryan/ Globe StaffClaw machines in the arcade at Swingers.David L. Ryan/ Globe Staff

Surrounding the hubbub are plenty of lounging areas — namely the lush “Greenhouse” and the Art Deco-esque “Clubhouse” cocktail bars. Locally inspired beverages round out the lengthy drink menu — there is a tequila concoction called a Masshole-In-One, or a Buzzards Bay Mule made with cranberry liqueur — and the grub comes courtesy of Emmy Squared Pizza, known for its New York-meets-Detroit pies.

The Boston location of Swingers is a partnership with Tavistock Restaurant Collection, which operates the nearby steakhouse Abe & Louie’s and seafood joint Atlantic Fish Company. (Another arm of the Tavistock Group, an investment firm, owns the 777 Boylston property.)

The food at Swingers comes courtesy of Emmy Squared Pizza.David L. Ryan/ Globe Staff

Meg Mainzer-Cohen, executive director of the Back Bay Association, said the venue was “the ultimate active lifestyle addition to the Back Bay.”

“People are looking for something more experiential as they go out,” she said, adding that she saw Swingers as providing “a great new opportunity for people to get together and be active and have fun together.”

A view of Swingers in the Back Bay.David L. Ryan/ Globe Staff

Dana Gerber can be reached at dana.gerber@globe.com. Follow her @danagerber6.